\documentclass[12pt, openany, oneside]{book}

\usepackage{tikz}
\usepackage{float}
\usepackage{pgfplots}

\usepgfplotslibrary{fillbetween}

\pgfplotsset{every axis/.append style={
    axis x line=middle,
    axis y line=middle,
    axis line style={->},
}}

\input{style/structure.tex}

\hypersetup{pdftitle={Calculus Solution}, pdfauthor={Terry}}

\setlength{\parindent}{0em}

\begin{document}

\begingroup
\thispagestyle{empty}
\begin{tikzpicture}[remember picture, overlay]
    \node[inner sep=0pt] (background) at (current page.center) {\includegraphics[width=\paperwidth]{style/cover_page.pdf}};
    \draw (current page.center) node [fill=ocre!60!white,fill opacity=0.8,text opacity=1,inner sep=1cm]{\Huge\centering\bfseries\sffamily\parbox[c][][t]{\paperwidth}{\Huge \centering Calculus\\[10pt]
    {\Huge Solution}\\[10pt]}};
\end{tikzpicture}
\vfill
\endgroup

\newpage

\chapterimage{style/TOC.pdf}

\pagestyle{empty}

\setcounter{tocdepth}{0}
\tableofcontents

\chapterimage{style/chapter.pdf}

\include{parts/part1}
\include{parts/part2}
\include{parts/part3}
\include{parts/part4}
\include{parts/part5}

\end{document}